Please help me solve this

Can someone show me step by step how to do this?

12 3 4 5 6 7 8 9 10 time remaining 59: 02 charlie is evaluating the product of 0.09 and 0.05. he multiplies, and before placing the decimal, arrives at an answer of 45. after considering the decimal placement, what is charlie's final answer? 0.0045 0.045 0.45 0.4545 mark this and return

Is 0.8 a rational or irrational number